Gravity on Earth: the inescapable force
And then came Newton: gravity takes center stage
Satellites: what goes up doesn't always come down
The Solar System: a triumph for Newtonian gravity
Tides and tidal forces: the real signature of gravity
Interplanetary travel: the cosmic roller-coaster
Atmospheres: keeping planets covered
Gravity in the Sun: keeping the heat on
Reaching for the stars: the emptiness of outer space
The colors of stars: why they are black (bodies)
Stars at work: factories for the Universe
Birth to death: the life cycle of the stars
Binary stars: tidal forces on a huge scale
Galaxies: atoms in the Universe
Physics near the speed of light: Einstein stands on Galileo's shoulders


Relating to Einstein: logic and experiment in relativity
Spacetime geometry: finding out what is not relative
Einstein's gravity: the curvature of spacetime in the Solar System
Einstein's recipe: fashioning the geometry of gravity
Neutron stars: laboratories of strong gravity
Black holes: gravity's one-way street
Gravitational waves: gravity speaks
Gravitational lenses: bringing the Universe into focus
Cosmology: the study of everything
Big Bang: the seed from which we grew
Einstein's Universe: the geometry of cosmology
Ask the Universe: cosmic questions at the frontiers of gravity
Appendix A. Useful constants: values used in this book
Appendix B. Background: what you need to know before you start.